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da0e9ce3 | 1 | #include "EvtGenBase/EvtPatches.hh" |
2 | /******************************************************************************* | |
3 | * Project: BaBar detector at the SLAC PEP-II B-factory | |
4 | * Package: EvtGenBase | |
5 | * File: $Id: EvtValError.cc,v 1.7 2004/12/21 19:58:50 ryd Exp $ | |
6 | * Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002 | |
7 | * | |
8 | * Copyright (C) 2002 Caltech | |
9 | *******************************************************************************/ | |
10 | ||
11 | #include <assert.h> | |
12 | #include <math.h> | |
13 | #include <iostream> | |
14 | #include "EvtGenBase/EvtValError.hh" | |
15 | using std::endl; | |
16 | using std::ostream; | |
17 | ||
18 | EvtValError::EvtValError() | |
19 | : _valKnown(0), _val(0.), _errKnown(0), _err(0.) | |
20 | {} | |
21 | ||
22 | EvtValError::EvtValError(double val) | |
23 | : _valKnown(1), _val(val), _errKnown(0), _err(0.) | |
24 | {} | |
25 | ||
26 | EvtValError::EvtValError(double val, double err) | |
27 | : _valKnown(1), _val(val), _errKnown(1), _err(err) | |
28 | {} | |
29 | ||
30 | EvtValError::EvtValError(const EvtValError& other) | |
31 | : _valKnown(other._valKnown), _val(other._val), | |
32 | _errKnown(other._errKnown), _err(other._err) | |
33 | {} | |
34 | ||
35 | EvtValError::~EvtValError() | |
36 | {} | |
37 | ||
38 | double EvtValError::prec() const | |
39 | { | |
40 | assert(_valKnown && _errKnown); | |
41 | return ( _val != 0) ? _err/_val : 0; | |
42 | } | |
43 | ||
44 | void EvtValError::operator=(const EvtValError& other) | |
45 | { | |
46 | _valKnown = other._valKnown; | |
47 | _val = other._val; | |
48 | _errKnown = other._errKnown; | |
49 | _err = other._err; | |
50 | } | |
51 | ||
52 | void EvtValError::operator*=(const EvtValError& other) | |
53 | { | |
54 | assert(_valKnown && other._valKnown); | |
55 | ||
56 | // Relative errors add in quadrature | |
57 | if(_errKnown && other._errKnown) | |
58 | _err = _val * other._val * sqrt(prec()*prec() + other.prec() * other.prec()); | |
59 | else _errKnown = 0; | |
60 | ||
61 | // Modify the value | |
62 | _val *= other._val; | |
63 | } | |
64 | ||
65 | void EvtValError::operator/=(const EvtValError& other) | |
66 | { | |
67 | assert(_valKnown && other._valKnown && other._val != 0.); | |
68 | ||
69 | // Relative errors add in quadrature | |
70 | if(_errKnown && other._errKnown) | |
71 | _err = _val/other._val * sqrt(prec()*prec() + other.prec() * other.prec()); | |
72 | else _errKnown = 0; | |
73 | ||
74 | // Modify the value | |
75 | _val /= other._val; | |
76 | } | |
77 | ||
78 | ||
79 | void EvtValError::print(ostream& os) const | |
80 | { | |
81 | if(_valKnown) os << _val; | |
82 | else os << "Undef"; | |
83 | os << " +/- "; | |
84 | if(_errKnown) os << _err; | |
85 | else os << "Undef"; | |
86 | os << endl; | |
87 | } | |
88 | ||
89 | ||
90 | void EvtValError::operator+=(const EvtValError& other) | |
91 | { | |
92 | assert(_valKnown); assert(other._valKnown); | |
93 | _val += other._val; | |
94 | ||
95 | // add errors in quadrature | |
96 | ||
97 | if(_errKnown && other._errKnown) { | |
98 | ||
99 | _err = sqrt(_err*_err + other._err*other._err); | |
100 | } | |
101 | else { | |
102 | ||
103 | _errKnown = 0; | |
104 | } | |
105 | } | |
106 | ||
107 | void EvtValError::operator*=(double c) { | |
108 | ||
109 | assert(_valKnown); | |
110 | _val *= c; | |
111 | if(_errKnown) _err*=c; | |
112 | } | |
113 | ||
114 | ||
115 | EvtValError operator*(const EvtValError& x1, const EvtValError& x2) | |
116 | { | |
117 | EvtValError ret(x1); | |
118 | ret *= x2; | |
119 | return ret; | |
120 | } | |
121 | ||
122 | EvtValError operator/(const EvtValError& x1, const EvtValError& x2) | |
123 | { | |
124 | EvtValError ret(x1); | |
125 | ret /= x2; | |
126 | return ret; | |
127 | } | |
128 | ||
129 | ||
130 | EvtValError operator+(const EvtValError& x1, const EvtValError& x2) | |
131 | { | |
132 | EvtValError ret(x1); | |
133 | ret += x2; | |
134 | return ret; | |
135 | } | |
136 | ||
137 | ||
138 | EvtValError operator*(const EvtValError& x,double c) | |
139 | { | |
140 | EvtValError ret(x); | |
141 | ret*=c; | |
142 | return ret; | |
143 | } | |
144 | ||
145 | ||
146 | EvtValError operator*(double c,const EvtValError& x) | |
147 | { | |
148 | EvtValError ret(x); | |
149 | ret*=c; | |
150 | return ret; | |
151 | } | |
152 | ||
153 | ||
154 | ostream& operator<<(ostream& os, const EvtValError& other) | |
155 | { | |
156 | other.print(os); | |
157 | return os; | |
158 | } | |
159 | ||
160 |